Indefinite Integration

$\quad \log \left(\frac{x^3}{x^3+1}\right)+\mathrm{c}$, where c is the constant of integration

$\frac{1}{3} \log \left(\sqrt[3]{\frac{x^3}{x^3+1}}\right)+\mathrm{c}$, where c is the constant of integration

$\quad \log \left(\sqrt[3]{\frac{x^3}{x^3+1}}\right)+\mathrm{c}$, where c is the constant of integration

$\frac{1}{3} \log \left(\frac{x^3+1}{x^3}\right)+\mathrm{c}$, where c is the constant of integration